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0
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3answers
101 views

Best kind of battery for electric motorcycle?

Sorry if this question doesnt belong here, I am new and learning. I want to try and build a DIY electric motorcycle, but am having issues finding the right batteries to use. I've tried searching for ...
0
votes
1answer
80 views

Understanding Battery rating

I need clarification regarding the rating of the battery shown in the below figure. I know battery ratings are given in Ah(Ampere-hour), but here it is given A/s. The picture is from "Linden's ...
0
votes
0answers
41 views

Difference in self discharge rate between Lithium iron phosphate battery vs Lithium Polymer Battery

What is the difference in self discharge rate between lithium iron phosphate battery and lithium polymer battery? I have a remote application in which the self discharge rate matters a lot.
0
votes
1answer
53 views

Lead Acid max discharge rate?

I am building a flashlight using a large(ish) 35W HID headlamp from a car, and I'm having troubles choosing a good battery technology. The inverter draws about 3.5A - 4A at 12V, tested on a large ...
0
votes
1answer
108 views

Is it OK to trickle charge a disposable battery [duplicate]

So I am playing around with designing a UPS when another question hit me. If I have a source feeding a small amount of current into a non-rechargeable battery is this OK. By OK, I mean is this ...
0
votes
3answers
145 views

Sanyo battery: what 430MH stands for?

I have a SANYO NI-MH battery from my Oral-B toothbrush. I reads 430MH. Now I'm curious what does 430MH stand for? Im thinking its probably nickel–metal hydride if ...
2
votes
1answer
106 views

Is there an easy way to protect a PCB from leaked electrolyte?

I've come across a LED flashlight that has rather curious design. The flashlight is rather powerful - it can notably heat up in "turbo" mode and so the driver definitely deals with some serious ...
2
votes
2answers
146 views

Alkaline cells vs. LED flashlight

I have (had, actually) an El Cheapo pocket LED flashlight powered by 3 AAA cells. It was shipped with very low quality "salt" cells (regular, low weight - someone please suggest a proper English name ...
0
votes
2answers
205 views

is a higher voltage battery a more efficient energy deliverer than a lower voltage battery?

a DC electric motor moving a car. will it experience the same torque with current provided from a 4V battery with a capacity of 1000 Ah as with current provided from a 400V battery with a capacity of ...
0
votes
1answer
127 views

relationship between battery voltage and discharge rate

I guess my question roots from me not understanding what a load represents to the battery. Is a 4V battery able to discharge at a higher rate (C rate) than a 2V battery? Or does it completely depend ...
1
vote
2answers
163 views

Best value Lithium ion/polymer cells/batteries

I've built a sound reactive, android controlled, wearable RGB LED matrix/suit which I'm currently powering with a rather heavy 12V 3Ah SLA battery. I'm looking to switch to lithium or ni-mh packs and ...
4
votes
1answer
169 views

The voltage of capacitor across battery never reaches battery voltage

I made some homemade vinegar batteries. The voltage of each cell was measured around 0.45V. I have 18 of them in series and I measured around 6.5V for the whole chain. Since the vinegar batteries ...
6
votes
1answer
439 views

New alkaline batteries with 10-year shelf life—what's changed?

I'm finding that some new alkaline batteries, such as the new Duracell Duralock and Energizer Power Seal batteries, have a shelf life of 10 years. Most other alkaline batteries have a shelf life of 7 ...
3
votes
2answers
480 views

How fast may I trickle charge a full LSD NiMH battery?

I've bought two packages of low-self-discharge nickel-metal hydride AA batteries, each made by a different well-known battery manufacturer. Sadly, the datasheets aren't very detailed: • One ...
4
votes
1answer
814 views

Lithium-ion rechargeable battery, shelf life

For Lithium-ion rechargeable batteries, that have never been charged, or been charged like 2-3 times at most, some 2-3 years back, and having since-then been in packaged condition, what should I ...
3
votes
1answer
98 views

What makes primary batteries leak on very deep discharge?

From my experience, if a primary (alkaline or zink) battery is left in a device with very low consumption (like a remote control, or a quartz watch) then at some point all the energy is drained and ...
2
votes
1answer
180 views

Can a lead-acid battery charger be used for “Gel” type?

I have a PB-600-24 lead acid battery charger. Can I use it for the battery type that has an image as below? 4 of the batteries are in series.
6
votes
1answer
189 views

If I turn a AA around will it drain or damage electronics?

I have an Apple Bluetooth keyboard. The thing turns on all the time when I put it in my backpack. This is bad because it blocks the soft keyboard on my phone. It runs on 2 AA batteries. Lately, I ...
5
votes
3answers
649 views

Why does connecting batteries in series result in doubled current sourcing while shorting?

I have Duracell Ultra Power AAA batteries, current draw is around 2.5A when shorting for single unit. I have just tried connecting them in series and parallel then measure discharge current. ...
2
votes
2answers
186 views

Electrons' flow misconception?

Conductors have a single electron in the last band, these electrons get pushed forward by electrons coming from the source (Battery), each electron pushes its neighbor and so on. Current is the flow ...
17
votes
3answers
4k views

What's the highest theoretical energy density for a chemical battery?

This is more a physics/chemistry/nanotech question, but what's the theoretical best energy density you could get out of a chemical battery (or fuel cell), if you could arrange atoms in any manner you ...